<script>
import {defineComponent} from 'vue'
import a from './a.vue';
export default defineComponent({
  name: "b",
  extends: a,
  data() {
    return {
      a: 456
    }
  },
  watch: {
    a() {
      console.log('111111')
    }
  },
  created() {
    this.a = 111112222
  }
})
</script>

<style scoped>

</style>